Well, for your entertainment, here's the flip side. David Atkins passes along the map below, which shows economic activity in the United States. The 25 or so largest urban centers in America account for half of all economic activity.

Well, for your entertainment, here's the flip side. David Atkins passes along the map below, which shows economic activity in the United States. The 25 or so largest urban centers in America account for half of all economic activity.